Răspuns :
x ^ 2 + 6x + 9 - y ^ 2 = descompunem in factori Expresia x ^ 2 + 6x + 9 folosind formula a ^ 2 + 2ab + b ^ 2 = ( a + b ) ^ 2
( x + 3 ) ^ 2 - y ^ 2 = descompunem in factori Expresia folosind formula a ^ 2 - b ^ 2 = ( a - b ) ( a + b )
( x + 3 - y ) ( x + 3 + y )